Shower arm



FIG. 1 is a perspective view of a shower arm showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is an enlarged detail view of portion 9 in FIG. 1.

The broken lines throughout the drawing figures depict portions of the shower arm that form no part of the claimed design.

The dot dash broken line indicates cutoff boundaries for enlarged detailed portion views and form no part of the claim. 

CLAIM The ornamental design for a shower arm, as shown and described. 